By Vitaly Bergelson.
Published in Ergodic Theory of Z-d-actions, London Mathematical Society Lecture Note Series 228, pp. 1–61.
Author-hosted text: people.math.osu.edu/bergelson.1/ertupdatenov6.pdf
Publication details: Author's publication list, first entry
By Vitaly Bergelson, Neil Hindman and Kendall Williams. Author-hosted primary manuscript: people.math.osu.edu/bergelson.1/BHW_PolynomialMT.pdf
Definition1.5 and Theorem1.6 specify the positive-coefficient separated-block systems and their monochromatic sum subsystems; Theorem1.4 states the underlying Milliken-Taylor theorem.